i tell people that come into my brick and mortar..."by the pound" anything after 1975. most people just leave them....there are no stores around that deal in cards near me (used to be 3-5 depending on the year) you might put more of your own time reaseaching that money you would realise. i dont bother myself....but then im no expert.
You are going to have to go through them to get the best bang for your buck. Try and put completed sets together, pick out any good cards and sell them individaly. Whatever you have left, the best thing to do with them is to either sell them as a large lot in a yard sale to get rid of them of just give them to a kid and make him real happy. Sports cards don't sell like they used to. This is my experience when I bought a large lot.